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Analytical Chem Lab Report 2

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Report : Experiment 2

Determination of the Percent Purity of KHP in an Unknown Sample

Part 1- Standardization of NaOH Solution

Titration Mass of KHP (g)

Moles KHP

(mol)

Volume NaOH solution used (L)

1 0.7194 0.003523

0.03108

2

3

0.7360

0.7219

0.003604

0.003535

0.02989

0.03171

4 0.7020 0.003437 0.02925

If you ran more than 3 trials, please add rows to this table

Moles of NaOH

(mol)

0.003523

0.003604

0.003535

0.003437

Average Molarity of NaOH

Standard Deviation

0.1157 M NaOH

0.0041 M

Coefficient of Variance

(also known as percent relative standard deviation)

3.5%

Part 2- Determination of the Percent KHP of the Unknown Sample

Unknown sample number: K-35

Titration

Mass of the sample (g)

Volume NaOH solution used

(L)

Moles of

NaOH (mol)

KHP

(mol)

Calculated mass of KHP

(g)

Concentration of NaOH (M)

0.1133

0.1206

0.1115

0.1157

% purity of

KHP

1

2

3

1.2048

1.2020

1.2016

0.01339

0.0134

0.0133

0.001549 0.001549

0.00155

0.00153

If you ran more than 3 trials, please add rows to this table

0.00155

0.00153

Average % KHP in unknown

Standard Deviation

Coefficient of Variance

26.25%

0.08

0.3%

0.3164

0.3166

0.3143

26.26

26.34

26.15

1

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